COMBINED WATERMARKING AND FINGERPRINTING

摘要

Content fingerprints and watermarks are combined in various ways for content identification applications. Fingerprints are used to identify content generally while watermarks provide more detailed localization of parts within the content, and vice versa. Fingerprint techniques are further used for signal synchronization and other pre-processing steps to assist in digital watermark decoding. A variety of fingerprint/watermark techniques identify characteristics of the channel of content from content samples.

主权项

1. A method of content recognition comprising:
receiving an audio signal captured from a microphone; sampling the audio signal at a first resolution to provide a first sampled audio signal; computing at least a first audio fingerprint from the first sampled audio signal; transferring the first audio fingerprint to a remote server, and in response, receiving metadata identifying a TV show, advertisement, movie or song from which the audio signal has been captured; sampling the audio signal at a second resolution to provide a second sampled audio signal; extracting a multibit payload encoded in the second sampled audio signal; transferring the multibit payload to a remote server, and in response, receiving metadata indexed by the multibit payload; and providing for display on a display device the metadata identifying a TV show, advertisement, movie or song and the metadata indexed by the multibit payload.